National Guard arrive in Ferguson

A girl holds a sign as she protests the shooting of Michael Brown August 21, 2014 in Ferguson, Missouri. Crowds continue to gather to march along Florissant Road after Brown was fatally shot by Ferguson Police Officer Darren Wilson August 9th. AFP PHOTO/Joshua LOTT (Photo credit should read Joshua LOTT/AFP/Getty Images)

FERGUSON, MO - AUGUST 21:
After all other protesters were gone, a group of young men gather to strategize about how to better themselves and their communities and to mold themselves into civil rights leaders in a community roiled by the police shooting of an unarmed African American teen on Wednesday, August 21, 2014, in Ferguson, MO. The killing of 18-year-old Michael Brown by white police officer Darren Wilson on August 9 has sparked nightly clashes between protesters and law enforcement officers that highlight the racial mistrust of the criminal justice system.
(Photo by Jahi Chikwendiu/The Washington Post via Getty Images)

DENVER, CO. - AUGUST 21: Emily Holloway joins protestors at Lincoln Park in downtown Denver, CO August 21, 2014. Activists from Anonymous had called for the 'Day of Rage' protest in cities across the country in support of demonstrators in Ferguson, Missouri. Holloway said, 'I'm just here for the people. I love human beings more than anything in the world. and I can't stand to see them treated unjustly.' (Photo By Craig F. Walker / The Denver Post)

WASHINGTON, DC - AUGUST 21: Activists from Anonymous raise their hands as theyt participate in a Day Of Rage protest in front of the White House, August 21, 2014 in Washington, DC. The group held protests in other cities as well in support of demonstrators in Ferguson, Missouri. (Photo by Mark Wilson/Getty Images)

FERGUSON, MO - AUGUST 21: Police stand guard along Florissant Avenue to prevent a repeat of the unrest that followed the recent death of Michael Brown on August 21, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 21: Police stand guard along Florissant Avenue to prevent a repeat of the unrest that followed the recent death of Michael Brown on August 21, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 21: Police stand guard along Florissant Avenue to prevent a repeat of the unrest that followed the recent death of Michael Brown on August 21, 2014 in Ferguson, Missouri. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

Captain Ron Johnson of the Missouri Highway Patrol speaks to media during a protest on West Florissant Avenue in Ferguson, Missouri on August 18, 2014. Police fired tear gas in another night of unrest in a Missouri town where a white police officer shot and killed an unarmed black teenager, just hours after President Barack Obama called for calm. AFP PHOTO / Michael B. Thomas (Photo credit should read Michael B. Thomas/AFP/Getty Images)

ST LOUIS, MO - AUGUST 18: Dr, Michael Baden points to an autopsy diagram showing where the gun shots hit Michael Brown as family attorney's Benjamin Crump (L) and Daryl Parks look on during a press conference at the Greater St. Marks Family Church on August 18, 2014 in Ferguson, Missouri. Unarmed teenager Michael Brown was shot and killed by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

ST LOUIS, MO - AUGUST 18: Dr, Michael Baden points to his head where one of the gun shots hit Michael Brown as family attorney's Benjamin Crump (L) and Daryl Parks look on during a press conference at the Greater St. Marks Family Church on August 18, 2014 in Ferguson, Missouri. Unarmed teenager Michael Brown was shot and killed by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

ST LOUIS, MO - AUGUST 18: The family attorney for Michael Brown, Benjamin Crump, raises his fingers to indicate that 6 gun shots were the minimum number of times the 18 year old teenager was hit during a press conference at the Greater St. Marks Family Church on August 18, 2014 in Ferguson, Missouri. Unarmed teenager Michael Brown was shot and killed by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

FERGUSON, MO - AUGUST 17: A woman has her face doused with milk after suffering the effects of tear gas used by police at a protest of the death of Michael Brown August 17, 2014 in Ferguson, Missouri. Tensions still run high in the Ferguson community after 18 -year-old Michael Brown was killed by a Ferguson police officer August 9 on Canfield Drive. (Photo by Joshua Lott/Getty Images)

FERGUSON, MO - AUGUST 17 : Demonstrators protesting Michael Brown's murder high-five each other August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death.. (Photo by Joshua Lott/Getty Images)

FERGUSON, MO - AUGUST 17: A man runs through the haze as tears gas fills the street during a demonstration over the killing of teenager Michael Brown by a Ferguson police officer on August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Police advance on demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Police advance on demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Demonstrators protesting the killing of teenager Michael Brown by a Ferguson police officer try to stand their ground despite being overcome by tear gas on August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A man is overcome by tear gas which police launched at demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A woman is helped from the street after becoming overcome by tear gas during a demonstration over the killing of teenager Michael Brown by a Ferguson police officer on August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his August 9, death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Tear gas reigns down on a woman kneeling in the street with her hands in the air after a demonstration over the killing of teenager Michael Brown by a Ferguson police officer on August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his August 9, death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Tear gas fills the street as a demonstrator walks through the haze during protests over the killing of teenager Michael Brown by a Ferguson police officer, on August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his August 9, death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Police advance through a cloud of tear gas toward demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A man covers his face to lessen the affect of tear gas that police launched at demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A person runs through a clowd of tear gas that police launched at demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A demonstrator holds up his hands in a cloud of tear gas as police fire it at a group of people protesting the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades as violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

FERGUSON, MO - AUGUST 17: Demonstrators react as police fire tear gas at them while protesting the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades as violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

FERGUSON, MO - AUGUST 17: Police advance while sending a volley of tear gas toward demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Police advance through a cloud of tear gas toward demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A man gets help after being overcome by tear gas that police launched at demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Demonstrators protesting the killing of teenager Michael Brown by a Ferguson police stand in a cloud of tear gas after the protest was attacked by police August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A demonstrator throws a tear gas canister back at police after they fired the gas at them while protesting the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades as violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

FERGUSON, MO - AUGUST 17: A demonstrator picks up a tear gas canister to throw back at police after they fired the gas at them while protesting the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades as violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

FERGUSON, MO - AUGUST 17: Demonstrators react as police fire tear gas at them while protesting the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades as violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

FERGUSON, MO - AUGUST 17: Demonstrators react as police fire tear gas at them while protesting the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades as violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

FERGUSON, MO - AUGUST 17: A demonstrator protesting the killing of teenager Michael Brown by a Ferguson police officer stands in a cloud of tear gas after the protest was attacked by police on August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A demonstrators protesting the death of Michael Brown runs amid tear gas used by police August 17, 2014 in Ferguson, Missouri. Tensions still run high in the Ferguson community after 18 -year-old Michael Brown was killed by a Ferguson police officer August 9 on Canfield Drive. (Photo by Joshua Lott/Getty Images)

FERGUSON, MO - AUGUST 17: Police advance through a cloud of tear gas toward demonstrators protesting the killing of teenager Michael Brown on August 17, 2014 in Ferguson, Missouri. Police shot smoke and tear gas into the crowd of several hundred as they advanced near the police command center which has been set up in a shopping mall parking lot. Brown was shot and killed by a Ferguson police officer on August 9. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Demonstrators protesting the killing of teenager Michael Brown by a Ferguson police run through a cloud of tear gas after the protest was attacked by police August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: A demonstrator protesting the killing of teenager Michael Brown by a Ferguson police officer throws a tear gas grenade back toward police after the protest was attacked by police August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his death. (Photo by Scott Olson/Getty Images)

FERGUSON, MO - AUGUST 17: Demonstrators react as police fire tear gas at them while protesting the shooting death of Michael Brown on August 17, 2014 in Ferguson, Missouri. Police sprayed pepper spray, shot smoke, gas and flash grenades as violent outbreaks have taken place in Ferguson since the shooting death of Michael Brown by a Ferguson police officer on August 9th. (Photo by Joe Raedle/Getty Images)

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FERGUSON, Mo. (AP) - The National Guard arrived in Ferguson but kept its distance from the streets where protesters clashed again with police, as clouds of tear gas and smoke hung over the St. Louis suburb where Michael Brown was fatally shot by a police officer.

Protesters filled the streets after nightfall Monday, and officers trying to enforce tighter restrictions at times used bullhorns to order them to disperse. Police deployed noisemakers and armored vehicles to push demonstrators back. Officers fired tear gas and flash grenades.

Capt. Ron Johnson of the Missouri Highway Patrol, who is in charge of security in Ferguson, said bottles and Molotov cocktails were thrown from the crowd and that some officers had come under heavy gunfire. At least two people were shot and 31 were arrested, he said. He did not have condition updates on those who were shot. Johnson said four officers were injured by rocks or bottles.

Demonstrators no longer faced the neighborhood's midnight-to-5 a.m. curfew, but police told protesters that they could not assemble in a single spot and had to keep moving. After the streets had been mostly cleared, authorities ordered reporters to leave as well, citing the risk from gunfire that had been reported.

A photographer for the Getty photo agency was arrested while covering the demonstrations and later released. Two German reporters were arrested and detained for three hours. Conservative German daily Die Welt said correspondent Ansgar Graw and reporter Frank Herrmann, who writes for German regional papers, were arrested after allegedly failing to follow police instructions to vacate an empty street. They said they followed police orders.

Johnson said members of the media had to be asked repeatedly to return to the sidewalks and that it was a matter of safety. He said in some cases it was not immediately clear who was a reporter but that once it was established, police acted properly.

Citing "a dangerous dynamic in the night," Johnson also urged protesters with peaceful intent to demonstrate during the daytime hours.

The latest clashes came after a day in which a pathologist hired by the Brown family said the unarmed 18-year-old suffered a bullet wound to his right arm that may indicate his hands were up or his back was turned. But the pathologist said the team that examined Brown cannot be sure yet exactly how the wounds were inflicted until they have more information.

Witnesses have said Brown's hands were above his head when he was repeatedly shot by an officer Aug. 9.

The independent autopsy determined that Brown was shot at least six times, including twice in the head, the family's lawyers and hired pathologists said.

The St. Louis County medical examiner's autopsy found that Brown was shot six to eight times in the head and chest, office administrator Suzanne McCune said Monday. But she declined to comment further, saying the full findings were not expected for about two weeks.

A grand jury could begin hearing evidence Wednesday to determine whether the officer, Darren Wilson, should be charged in Brown's death, said Ed Magee, spokesman for St. Louis County's prosecuting attorney.

A third and final autopsy was performed Monday for the Justice Department by one of the military's most experienced medical examiners, Attorney General Eric Holder said.

Holder was scheduled to travel to Ferguson later this week to meet with FBI and other officials carrying out an independent federal investigation into Brown's death.

The Justice Department has mounted an unusually swift and aggressive response to Brown's death, from the independent autopsy to dozens of FBI agents combing Ferguson for witnesses to the shooting.

In Washington, President Barack Obama said the vast majority of protesters in Ferguson were peaceful, but warned that a small minority was undermining justice. Obama said overcoming the mistrust endemic between many communities and their local police would require Americans to "listen and not just shout."

Obama said he also spoke to Missouri Gov. Jay Nixon about his deployment of the National Guard in Ferguson and urged the governor to ensure the Guard was used in a limited way.

Brown family attorney Benjamin Crump said Brown's parents wanted the additional autopsy because they feared results of the county's examination could be biased. Crump declined to release copies of the report.

"They could not trust what was going to be put in the reports about the tragic execution of their child," he said during Monday's news conference with Parcells and Baden, who has testified in several high-profile cases, including the O.J. Simpson murder trial.

The second autopsy, Crump said, "verifies that the witness accounts were true: that he was shot multiple times."

Forensic pathologist Shawn Parcells, who assisted former New York City chief medical examiner Dr. Michael Baden during the private autopsy, said a bullet grazed Brown's right arm. He said the wound indicates Brown may have had his back to the shooter, or he could have been facing the shooter with his hands above his head or in a defensive position across his chest or face.

"We don't know," Parcells said. "We still have to look at the other (elements) of this investigation before we start piecing things together."

Baden said one of the bullets entered the top of Brown's skull, suggesting his head was bent forward when he suffered that fatal injury. The hired pathologists said Brown, who also was shot four times in the right arm, could have survived the other bullet wounds.

Baden also said there was no gunpowder residue on Brown's body, indicating he was not shot at close range. However, Baden said he did not have access to Brown's clothing, and that it was possible the residue could be on the clothing.

Crump also noted that Brown had abrasions on his face from where he fell to the ground, but there was "otherwise no evidence of a struggle."

___

Associated Press writers Alan Scher Zagier in Ferguson, Jim Salter in St. Louis and David A. Lieb in Jefferson City contributed to this report.